The dam1021 is a DAC module based on a discrete R-2R sign magnitude DAC design, with FPGA based FIFO buffering/re-clocking and custom digital filters, < 1 ps jitter clock generator, with 28 bit resolution so there is headroom, oversampling up to 3.072 Mhz. Up to 24 bit / 384 Khz input from SPDIF, I2S and USB (via USB to I2S interface board), with isolation on the I2S interface. The board is very flexible, with digital volume control and filter parameters that can be downloaded. The board is fully firmware up-gradable over a simple serial connection, which enable new features later on. Now full support for DSD when using firmware version 1.05 or newer.
What is the difference between boards using 0.01%, 0.02% or 0.05% resistors ?
Only the harmonic distortion get better with more precise resistors, and typically they will sound much the same as the resistors initially are better then specified. But the more precise resistors has smaller temperature drift and better long term stability, and therefore will be better in the long term.
|THD @ -1db||0.006%||0.015%|
|THD @ -60dB||0.03%||0.09%|
|Resistor Precision||28 bit, 0.01% – 0.02% Resistors||28 bit, 0.05% Resistors|
|Clock Jitter RMS||0.8 pS typical|
|S/N 20 Khz Bandwith||127 dB unweighted|
|Frequency Range +0.1dB -1.0dB||20hz – 20Khz|
|Input SPDIF||Coax and Toslink, Up to 24 bit / 192 Khz|
|Input I2S PCM||Fully Isolated, Up to 24 bit / 384 Khz|
|Input I2S DSD||Fully Isolated, Up to DoP128 and DSD256|
|Output unbuffered||Single ended 1.4V RMS, Zout 640R|
|Output buffered||Balanced 4.0V RMS, Zout 20R|
|Power input||7-8V AC or +-7-15V DC max 5W|
|Board size||3.2″ x 5.8″ (81 x 147 mm)|